This program prompts the user for integer values to be used as the RGB levels of red, green and blue. Since RGB values cannot be less than 0 or greater than 255 the program will repeat if invalid intergers are entered. Additionally, the program uses the weighted average method to produce the grayscale version of the three inputed colors. Then, the program saves the inputed RGB colors and the grayscale colors to a file of the users choice. These conversion will be used at a later time to check for colorblindness readability. In addition to RGB colors, the user has the option to choose a general color or to choose a default color (black). At a later time shade of the general color will be given to check for colorblindness readability. Furthermore, if this program were to continue to be developed adding the ability to iterate through the process of obtaining the colors as many times as the user chooses could be useful.
The additional features added to this program include choosing a default value and showing the user which RGB value was out of the range of valid inputs, given an invalid RGB value was entered. A classes regarding the RGB values was create to store the original user inputed RGB vector, the grayscale verson of the RGB vector, and all of the relevant functions regarding RGB vectors. The program also now tells the user if their color is primarily red, green or blue. Along with adding new features to this program, the previous features were updated in order to follow good style and best practices. These updates include fixing indentation errors and improving the use of comments for clarity.
Now, in addition to entering RGB values the user will have the option to enter a general color(s). In order to perform these tasks multiple times functionality has been added to the program. The functions that have been created are: one to give the option to enter an RGB value or general color, one to enter RGB values, one to choose a general color, functions to display the RGB color(s) or general color(s), and a function to calculate the weighted grayscale RGB colors. Additionally, a function was created in order to write to a file. Currently it is only used once, but it could be helpful to call upon in different sections of the program in future drafts.
Faith Fatchen
To run the program, give the following commands:
g++ -std=c++11 *.cpp -o cvp; ./cvp You will be prompted to pick the hue of red, green and blue for any number of colors or pick a general color from a list. The grayscale of the colors chosen via RGB values will then be calculated to check for colorblindness readability. Would you like to enter (R)GB values, (g)eneral color, or use (d)efault grayscale RGB value? r Please give a value between 0-255 for the intensity of red. 56 Please give a value between 0-255 for the intensity of green. 79 Please give a value between 0-255 for the intensity of blue. 67 The first RGB value is valid The second RGB value is valid The third RGB value is valid Your color is primarily blue The RGB values are: 56,79,67, The grayscale RGB values are: 16,46,7, What file would you like to save these colors to? text.txt Thank you for inputing your color choices. At a later time we will report the colorblindness readability.
Characters were used to store the user's decisions returned from functions that give users different color type choices. Vectors of integers were utilized to store the integer RGB values for the original color and grayscale color. Previously, individual integers were used to store each intensisty of the RGB colors. The vectors allow the program to store each RGB color in one place. Integers are the necessary datatype for the variables since RGB values must be whole numbers. Alternatively to a vector, an array of three components could have been declared, but the functionality of vectors such as adding to the vector was useful in the function that obtains the values for the vectors. Additionally, a string was used to store the general color choice. A string is appropriate since the user is choosing the general name of a color. Using a string compared to character improves the clarity of the program. A boolean variable was used to indicate whether the RGB value input was valid. This is the appropriate choice because the program needs to know whether a condition has been met. In other words, whether a condition is true or false.
In order to prompt the users decisions whether to enter a RGB or general color a cout statement was used, and cin is used to capture the users response. Cin is appropriate because ignore white space should not be necessary. Within the function that prompts the user to enter the desired RGB value or general color a cout is used to do so. To capture this desired statement a cin statement is used. Cin is sufficient since the only input needed at this stage is an integers or character. Hence we don't need to use getline() to ignore potential whitespace. Additional cout statements were used to print out the RGB, grayscale, and general colors to the user. Cout was chosen because we wanted the user to see their choices while using the program. Cout statements were also used to prompt the user to enter a filename, and cin statements were used to capture the filename. Again, the filename is not expected to have whitespace, so cin is sufficient.
In order to use the users decisions whether to enter and RGB color or general color if and else if were used. Else if was used instead of else in order to better understand the program. With the else if statement the condition explicitly shows what the program is directed to do for the decision of the user. Additionally, if statements were used to check the size of vectors before calling upon the display functions. If statements were used for each vector instead of else if since we wanted to check each condition. Within the function capturing the users general color choices, if, else if, and else statements were used for the color choice. Else if and else statements are appropriate since there will only be one color chosen, so if one statement is true we do not need to check the others. Else is sufficient for the last condition since the loop used in the function will only break when one of the three choices is entered. Hence, it is not a concern that the else statement would be invoked for an invalid choice.
A "for loop" was used within the display functions to print out the vectors. A "for loop" is the appropriate choice since we want the program to run through the loop a certain amount of times, in this case for the length of the vectors. "Do-while loops" were used within the functions capturing the users choices (whether to input a RGB or general color) in order to repeat the prompt for the choices while an invalid character was entered. Again, a do-while loop was used to repeat the request for RGB value and the general color character if an invalid value was entered. Do while loops are the most desirable because the code inside the loop needs to be executed at least once.
In addition to couting the RGB and grayscale choices, the user chooses a file to write the choices too. Since we are writting to a file, the file is opened using ios::app. Append was chosen over ios:writte so we can continue to add to the file without writting over the previous entries.
Vectors are used to store both the RGB values and grayscale rgb values. A vector of integers is used to store the RGB values. This is appropriate because we want to store all the values together. An array could also be used in order to maintain a fixed size, since we will always only want three integer values per color. The functions that input the RGB values only allow for three inputs, so having a vector that has too many values is not a problem. The functions assign the RGB values in the correct order beginning with the red value at place [0] and ending with the blue value at place [2]. Vectors were chosen instead of arrays for their functionality, particularly push_back.
The two functions for displaying the general colors and RGB values have the return type "void" because the purpose of the display functions is to print. The parameters needed are string for the general colors and a vector of integers for the RGB values. The parameters are passed by reference but kept constant. Passing by reference is appropriate due to the potential size of the vectors. Having these functions makes the program more clear and concise, and if desired they can be called upon multiple times with ease. A function which returns a character gives the user the option to choose a general color or enter RGB values. The returned character is used within the program for decisions. Using this function makes the program more clear and concise. This function does not require parameters since the purpose is just to get and return user input and return it to the program. The function that is used to collect the user input for the RGB values returns a vector, which is appropriate because the vector is used within the function. This function also does not require a parameter it just returns the vector to be stored in a vector declared in the program. The function that gets the general colors returns a string, which is appropriate since the general color is declared as a string in the main program. The function that is used to calculate the the grayscale vectors uses the return type void. This is appropriate because because it does not return anything. It does not need any parameters since it is declared in the class, so it has access to alter the private variables for the RGB vector and grayscale vector directly. For the file writting function void was used. The parameters were passed by reference but kept constant, again due to their potential size, the parameters needed are those that will be written to the file. Within the class, a function was created to check if the user inputed RGB values were valid. These values are stored in a vector, so the parameter needed is a vector of integers. This is passed by reference for potential size issues, and it is held constant since it is not supposed to be altered. For this funtion, the return type is bool. The purpose of the function is to check whether a condition is true or not then use this result in the program. Another function, declared in the class, that has the parameter of a vector of integers which is passed by reference and held constant for the same reason sets the user inputed RGB vector as the value for the private RGB vector within the class. The function that calculates the weighted grayscale of the inputed RGB vector has the return type vector of integers since this vector will be used in the main program. It does not have any parameters since it is a class member and has access to the RGB vector. The class member function which displays the strongest color for the user inputed RGB color has a return type void and no parameters. The return type void is appropriate because nothing from the function will be utilized elsewhere. Additionally, it does not need any parameters since it is has access to the class member variables.
A was class created to group the variables and functions regarding RGB values. The class allows the program to encapsulate all of the characteristics of the processes relevant to RGB values. It sets up a blue print for the actions taken regarding the RGB values. Within the class, the variables are appropriately stored as private, so only the member functions can access and alter them. A constructor is used to set default values for the member variables in order to avoid garabage values. The functions are declared as public in order to be utilized within the main progam. In the program, an object is created in order to access the class functions. This is an additional useful aspect to the class. It gives us the ability to create many objects for RGB values, and they would follow the blueprint set up by the class. Currently, the program just uses one object, but if the program was updated to allow the user to enter a user chosen number of RGB values the class would be very useful.
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